When placing an order using a school voucher: 

You need to enter your school voucher number on "Select Payment Methods" step of checkout or make sure to check the check box next to it if it was previously entered. Any remaining balance on your order must be paid with another school voucher or credit card.

Note: If you have a rental in your cart, you must add a credit card (NOT a debit card) to your payment methods section. This credit card should have an expiration date that is at least 5 months beyond your purchase date in accordance with our rental agreement.
Your credit card will only be charged if you do not return your rental on time and/or if you do not return your rental in acceptable condition.

Gift Certificate purchases can be found here: Gift Certificates